Device for improving the heat absorption of tubular boilers with boiler tubes located in the radiation chamber



July 15, 1930. M. EULE 1,770,606

DEVICE FOR IMPROVING THE HEAT ABSORPTION OF TUBULAR BOILERS WITH BOILER TUBES LOCATED IN THE RADIATION CHAMBER Filed Sept. 14, 1926 may 9 3 [ED 5) Mnrmmwvfs Patented duly 15, 1930 UNITED STATES PATENT OFFICE MARTIN EULE, OF SPANDAU, GERMANY, ASSIG NOR TO SIEMENS-SOHUOKERTWEKE GESELLSCHAFT MIT BESOHRKNKTEB HAITUNG, OF .SIEMENSSTADT, NEAR BERLIN, GERMANY, A CORPORATION OF GERMANY DEVICE FOR IMPROVING THE HEAT ABSORPTION OF TUBULAR BOILERS WITH BOILER TUBES LOCATED IN THE RADIATION Application filed September 14, 1926, Serial No. 185,450, and in Germany April 7, 1926.

My invention relates to a device for improving the heat absorption of tubular boilers with boiler tubes located in the radiation chamber.

It is well known that in such boilers the problem arises of transmitting, if possible, all the heat of radiation and sensible heat of the fuel to the tubes i. e. no heat should be consumed by the masonry which, when this condition is fulfilled, may be omitted almost completely. In attempting to solve this problem, ribs, gills or fins have been welded to the tubes. Gllled or ribbed tubes are, however, expensive in production and difiicult in 1 the assembly.

According to my invention the problem 1s solved, in a form simpler and by far cheaper than the prior art means, by bringing the boiler tubes in intimate contact with a plate which is a good conductor of heat and which absorbs the heat of radiation and the sensible heat of the furnace, as far as these have not already been absorbed by the boiler tubes, and transmits them to the boiler tubes by radiation and conduction and by making this attachment easily removable.

Embodiments of my invention are illustrated in the drawing aflixed hereto.

These drawings represent in:

Fig. -1 a transverse .section through one {modification on the line b-b in Fig. 1.

Fig. 1 a longitudinal section through the modification Fig. 1 on the line 0-0 in that figure,

Fig. 2 a longitudinal sectlon through another modificatlon, and

Fig. 2 a transverse section through Fig. 2 on the line aa. in that figure.

Like numerals of reference indicate like parts in all the figures of the drawing.

Referring to Figs. 1 and 1, 1 are the tubes traversed by the medium to be heated. These tubes 1 are pressed against plates 2 which absorb a portion of the heat of the furnace.

As the tubes 1, resting on bolsters 6 which partly surround the tubes and are assumed to extend the entire length of the tubes are thus in intimate contact with the plates 2 and these plates are good conductors of heat, a

50 portion'of the absorbed heat will be transmitted to the tubes 1 by conduction from the plates 2. Another part of the heat absorbed by the plates 2 is, furthermore, transmitted to the tubes .by radiation. The tubes are tightly drawn against the bolsters by removable straps 4, locked by wedge-shaped pieces 5 from the outside, or by other suitable removable means of attachment, for instance by the shackles 7 as shown in Fig. 2.

Referring to Fig. 2 and the cross-section Fig. 2, it will be seen that a wedge-shaped piece 3 is located between plate 2 and tube 1 and takes the place of bolster 6 in Fig. 1. Compared with the direct contact of the tube with the plate this design has the advantage that on expansion of the system due to the absorption of heat the wedge 3 slides downward under the action of gravity and thus maintains permanently a good heat-conducting connection between plate 2 and the tube 1. The tubes may be held to wall 2 by any suitable-means, for instance by shackles 7 bolted to plate 2 by bolts 4. These shackles as shown would be placed preferably near the ends of wedge bolsters 3, so that a nearly continuous heat convection contact is established along the whole length of each tube, whereby a similar heat transfer effect is attained as with the continuous bolsters 6 in Figs. 1 and 1.

Various modifications and changes may be made without departing from the spirit and the scope of the invention, and I desire, there-- fore, that only such limitations shall be placed thereon as are imposed by the prior art.

' I claim as my invention 1. Means for increasing the heat transfer to tubes in tubular boilers or the like, comprising a good heat conducting fire box wall on the heat exposed face of which the tubes are disposed, means for holding said tubes ing as bolsters for the tubes and tending 2. Means for increasing the heat transfer to tubes in tubular boilers or the like, comprising a good heat conducting fire box wall on the heat exposed face of which the tubes are disposed, heat conducting bolsters on said wall partway surrounding said tubes and on which the tubes rest, means for holding the tubes against the bolsters and means for insuring continuance of intimate contact of the tubes with said bolsters when the heat expansion moves the tubes awa from the wall.

In testimony whereof I a my si ature.

MARTIN E E. 

